If you have a plane with ailerons that are wider at the fuselage then the tip where do you measure the throw? Lets say the ailerons are 3" wide at the fuselage and 1" at the tip and the directions call for a 1" throw where do you measure that distance?

Thanks

if the instructions don't tell you where to measure...I do it mid point.....

Follow the instructions for that plane but most I had done want the measuremant done at the widest point.
Again each plane and manufacturer is different.
What plane exactly? Maybe you can get a more specific answer.

Nitro Models Extra 330L -90 63"

The directions are pitiful and they do not say....

Normally you should measure the throw at the thickest part of the control surface.

Ken

Nitro Models/CMP does have very limited instructions.
I suggest you look around at other Extra models of the same size that have downloadable instructions and see where they measure.
There is a downloadable manual of the Great Planes Extra 300S with a 64" WS, should be about the same, on this page:
http://www3.towerhobbies.com/cgi-bin...&I=LXJ580&P=ML

Thank you

The throw indicated in the manual of the Great Planes Extra 300S is 5/8" for high rate.
Since the width of the aileron is 2", the angle is about 9 degrees.

The referenced 1" throw for your Nitro Models Extra should be measured at the wider portion of the aileron, i.e. 3".
Then the angle of deflection will be 18 degrees.
If measured at the 1" width, the angle would be 45 degrees, which seems too much.

Regards!

Don't agonize over the throws....

Setting them to "about right" is sufficient.

You can later tune things if you want more throw.

The only thing you need to avoid is having far too much throws dialed in, and no way of setting things down if the plane is in the air.

Your best bet is to set the high rates for something approximating the recommended throws for a model of this type and size, and then set the low rates for about 60% of this.

That way if you find the plane too twichy in the air, you can flip to low rates and bring it down to adjust.

Typically however I go the other way....

I set high rates to give me everything I CAN get, with 50% expo applied...

Then low rates to 50% of this just in case, with 35% expo.

After I fly the plane I'll start adjusting the throws to suit my preferance and flying style.

To answer the basic question, control throws are always measured at the widest part of the surface. The wider part of a surface will move a larger distance than the narrower part. If the instructions call for 1" of throw, and it is set at the narrow end of the surface, the wide end will actually be moving more than one inch. Like it was said earlier, the amount isn't necessarily that critical, and it's best to set dual rates, with the low rate being real tame compared to the high rate, at least for a maiden flight. After you see how the plane reacts, you can adjust to your liking.

Jesse